Rack Mounting
When you prepare your equipment rack, ensure that the rack is earth ground.
Ground the equipment rack to the same ground point the power service in your area uses. The ground
path must be permanent.
Grounding
Use the S4820T in a common bond network (CBN).
Connect the grounding cables as described in Attaching the Ground Cable.
Fans and Airflow
The S4820T fans support two airflow options.
Be sure to order the fans suitable to support your site’s ventilation. Use a single type of airflow fan in your
system. Do not mix reverse and normal airflows in a single S4820T chassis.
• Normal — airflow is from the I/O panel to the power supply
• Reversed — airflow is from the power supply to the I/O panel
For proper ventilation, position the S4820T in an equipment rack (or cabinet) with a minimum of five
inches (12.7cm) of clearance around the exhaust vents. When you install two S4820T systems near each
other, position the two chassis at least five inches (12.7cm) apart to permit proper airflow. The acceptable
ambient temperature ranges are listed in Technical Specifications.
The fan speed increases when the internal temperature reaches 72°C and decreases to normal speed
when the temperature falls to 58°C. The switch never intentionally turns off the fans.
To see the log messages, use the show logging command. For more information, refer to the System
Logs
chapters of the FTOS Command Line Reference Guide for the S4820T System and FTOS
Configuration Guide for the S4820T System.
NOTE: Power Supplies and Fan Modules are field replaceable units. Dell Networking does not
support a mix of power supply types (such as, AC and DC) in the same switch. If a power supply is
added or replaced, it MUST match the existing type of power supply (such as, AC and AC or DC and
DC).
Power
To connect the chassis to the applicable power source, use the appropriate power cord with the S4820T
system.
A country/region-specific AC or DC power cord is included with the system.
When installing AC systems, follow the requirements of the National Electrical Code, ANSI/NFPA 70
where applicable.
The system is powered-up as soon as the power cord is connected between the system and the power
source.
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